Just keep the stocker and get a lip.

 

I remember reading a thread about "JDM impact beams" a while back. A couple of people pointed out that they do not exist, since the Japanese regulations did not require a 5 mph beam.

There a few kits out there that can made to fit. You either shave the beam or the bumper. I think people have done that to Monster Sport and HKS Kansai bumpers. Might want to do a search and ask those that have put them on before.